Will Ferrell's "Step Brothers" Expands Cast

Adam Scott and Mary Steenburgen have joined the cast of the Judd Apatow-produced comedy "Step Brothers," which Adam McKay is directing for Columbia Pictures. McKay is the man behind "Anchorman" and "Talladega Night," and will be re-teaming with both Will Ferrell and John C. Reilly on this new film.

The story revolves around Ferrell and Reilly, who will play coddled guys who live with their respective single parents. Their folks fall in love and marry, making the guys stepbrothers.

Scott is playing the younger, successful brother of Ferrell, while Steenburgen is playing their mother. Also joining the movie are Katherine Hahn as Scott's wife and Andrea Savage as Ferrell's therapist. Shooting is due to start next month.